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- F-type asteroidF-type asteroids are a relatively uncommon type of carbonaceous asteroid, falling into the
- F-type main-sequence starStellar classification
- Faber–Jackson relationPower law for galaxies
- Fabrizio BernardiFabrizio Bernardi (born 1972) is an Italian astronomer and discoverer of minor planets and
- Failed supernovaStar that dies but does not explode
- Faint blue galaxyType of galaxy
- Faint young Sun paradoxParadox concerning water on early Earth
- Falcon 9Partially-reusable medium-lift launch vehicle by SpaceX
- Family Portrait (Voyager)1990 Solar System image by Voyager 1
- Far side of the MoonHemisphere of the Moon that always faces away from Earth
- Far-infrared astronomyScientific study of celestial objects visible in wavelengths of 30-450 μm
- Faraday cupA Faraday cup is a metal (conductive) cup designed to catch charged particles. The resulti
- Fast Auroral SnapshoT ExplorerThe Fast Auroral SnapshoT Explorer (FAST or Explorer 70) was a NASA plasma physics satelli
- Fast radio burstAstronomical high energy transient pulse
- Félix Aguilar ObservatoryObservatory
- Félix Chemla LamèchFélix Chemla Lamèch (11 January 1894 – 14 May 1962) was a Greek-French astronomer, meteoro
- Felix HormuthFelix Hormuth (born 1975) is a German astronomer, working at the Max Planck Institute for
- Fenton Hill ObservatoryFenton Hill Observatory is an astronomical research facility operated by Los Alamos Nation
- Fermi paradoxDiscrepancy of the lack of evidence for alien life despite its apparent likelihood
- FG VirginisVariable star in the constellation Virgo
- Field galaxyGalaxy that does not belong to a larger cluster of galaxies
- Field of viewExtent of the observable world seen at any given moment
- Fifth GiantHypothetical gas giant ejected out of the Solar System
- Fifth planet (hypothetical)Other planets thought to be 5th from the Sun
- Filippo FronteraItalian astrophysicist (born 1941)
- Financial astrologyAstrology for events in financial markets
- Fine-Resolution Epithermal Neutron DetectorThe Fine-Resolution Epithermal Neutron Detector (FREND) is a neutron detector that is part
- Firehose instabilityDynamical instability of thin or elongated galaxies
- First light (astronomy)In astronomy, first light is the first use of a telescope (or, in general, a new instrumen
- First observation of gravitational waves2015 detection made by LIGO interferometers
- First point of AriesPoint on the celestial sphere
- First-magnitude starBrightest star in the night sky
- Fixed starsType of astronomical bodies
- FK Comae BerenicesStar in the constellation of Coma Berenices
- Flag (crater)Flag crater is a small crater in the Descartes Highlands of the Moon visited by the astron
- Flame NebulaEmission nebula in the constellation Orion
- Flamsteed designationStar identification system
- Flare starVariable star that brightens unpredictably
- Flatness problemCosmological fine-tuning problem
- FlatteningMeasure of compression between circle to ellipse or sphere to an ellipsoid of revolution
- Flocculent spiral galaxyPatchy galaxy with discontinuous spiral arms
- Flora familyGrouping of S-type asteroids
- Flux transfer eventEvent causing a magnetic portal to open between the Earth and the Sun
- Flux tubeTube-like region of space with constant magnet flux along its length
- Flyby (spaceflight)Flight event at some distance from the object
- Fobos-Grunt2011 Russian attempted sample-return mission to the Martian moon Phobos
- Focas (lunar crater)Focas is a small lunar impact crater that lies on the far side of the Moon, just past the
- Foe (unit)A foe is a unit of energy equal to 1044 joules or 1051 ergs, used to express the large amo
- FomalhautTriple star system in the constellation Piscis Austrinus
- Fomalhaut bExtrasolar object orbiting Fomalhaut
- Fondachelli-FantinaFondachelli-Fantina is a comune (municipality) in the Metropolitan City of Messina, Sicily
- Forbidden mechanismQuantum transitions that are not allowed in the most direct mechanism
- Forbush decreaseDecrease in cosmic ray intensity
- Formation and evolution of the Solar SystemThe formation of the Solar System began about 4.6 billion years ago with the gravitational
- FornaxConstellation in the southern celestial hemisphere
- Fornax ClusterGalaxy cluster in the constellation Fornax
- Fornax DwarfDwarf galaxy in the constellation Fornax
- Fra Mauro formationLocation on the Moon; landing site for the Apollo 14 mission
- Francesca E. DeMeoAmerican planetary scientist
- Francis BailyEnglish astronomer (1774–1844)
- François HammerFrench astrophysicist (born 1958)
- Frank DrakeAmerican astronomer and astrophysicist (1930–2022)
- Frank K. EdmondsonAmerican astronomer
- Franklin E. RoachFranklin Evans Roach (September 23, 1905 – September 21, 1993) was an American astronomer,
- Fraunhofer linesSpectral lines in the Sun's spectrum
- FRB 180916.J0158+65FRB 20180916B (previously known as FRB 180916.J0158+65, and less formally known as FRB 180
- Fred Gillett (astronomer)Frederick Carl Gillett (February 7, 1937 – April 22, 2001) was an American astronomer who
- Fred Lawrence Whipple ObservatoryAmerican astronomical observatory in Arizona
- Frederick de HoutmanFrederick de Houtman (c. 1571 – 21 October 1627) was a Dutch explorer, navigator, and colo
- Frederick PilcherAmerican astronomer and retired physics professor
- French Academy of TechnologiesThe National Academy of Technologies of France (Académie des technologies) is a learned so
- Fried parameterMeasure of imaging quality in astronomy
- Friedmann–Lemaître–Robertson–Walker metricMetric based on the exact solution of Einstein's field equations of general relativity
- Friedrich Wilhelm ArgelanderGerman astronomer (1799–1875)
- Frost lineDepth groundwater in soil is expected to freeze
- Frost line (astrophysics)Distance from a young star where ice forms
- Frosty Leo NebulaProtoplanetary nebula
- Frozen orbitOrbit in which natural drifting has been minimized
- FU Orionis starType of eruptive variable star
- Full moonLunar phase when the Moon is fully illuminated
- Fundamental plane (elliptical galaxies)Set of bivariate correlations among galaxies
- Furneaux GroupThe Furneaux Group is a group of approximately 100 islands located at the eastern end of B
- Future of an expanding universeAspect of physical cosmology
- Future of EarthLong-term future of planet Earth
